Control-C in the middle of a Terminus program leaves SBT in a bad state.

[kapunga]

I as testing my alert PR and I noticed that if you hit CNTL-C in the middle of running terminus.prompt, the terminal/SBT is left in a state where subsequent attempt to start sbt shutdown immediately. This appears to affect JVM runs, but not native runs.

➜  terminus git:(alert-effect) sbt
[info] welcome to sbt 1.10.6 (Amazon.com Inc. Java 17.0.6)
[info] loading global plugins from /Users/kapunga/.sbt/1.0/plugins
[info] loading settings for project terminus-build-build from plugins.sbt...
[info] loading project definition from /Users/kapunga/code/oss/terminus/project/project
[info] loading settings for project terminus-build from plugins.sbt...
[info] loading project definition from /Users/kapunga/code/oss/terminus/project
[info] loading settings for project root from build.sbt...
[info] resolving key references (14139 settings) ...
[info] set scmInfo to https://github.com/kapunga/terminus
[info] set current project to root (in build file:/Users/kapunga/code/oss/terminus/)
[info] sbt server started at local:///Users/kapunga/.sbt/1.0/server/494a69e2b0adc63550ef/sock
[info] started sbt server
sbt:root> coreJVM/run
[info] compiling 1 Scala source to /Users/kapunga/code/oss/terminus/core/jvm/target/scala-3.3.4/classes ...
[info] running terminus.prompt
How cool is this?
> Very cool
  Way cool
  So cool

➜  terminus git:(alert-effect) sbt
[info] welcome to sbt 1.10.6 (Amazon.com Inc. Java 17.0.6)
[info] loading global plugins from /Users/kapunga/.sbt/1.0/plugins
[info] loading settings for project terminus-build-build from plugins.sbt...
[info] loading project definition from /Users/kapunga/code/oss/terminus/project/project
[info] loading settings for project terminus-build from plugins.sbt...
[info] loading project definition from /Users/kapunga/code/oss/terminus/project
[info] loading settings for project root from build.sbt...
[info] resolving key references (14139 settings) ...
[info] set scmInfo to https://github.com/kapunga/terminus
[info] set current project to root (in build file:/Users/kapunga/code/oss/terminus/)
[info] sbt server started at local:///Users/kapunga/.sbt/1.0/server/494a69e2b0adc63550ef/sock
[info] started sbt server
sbt:root>
[info] shutting down sbt server
➜  terminus git:(alert-effect)

[noelwelsh]

Just to make sure I understand correctly, if you Control-C when running a JVM Terminus program from sbt, subsequent attempts to start sbt fail?

It's probably something to do with IGNBRK or the other mess of options described at https://www.man7.org/linux/man-pages/man3/termios.3.html

[kapunga]

Just to make sure I understand correctly, if you Control-C when running a JVM Terminus program from sbt, subsequent attempts to start sbt fail?

That's correct. I wonder if it's a problem with JLine because native is working fine.

[noelwelsh]

Yes. My guess is that is changes some terminal settings on startup, as it does provide methods to deal with control-c etc. No idea what the mismatch between JLine and sbt could be, though. It would probably require some code digging to find out. sbt does depend on JLine, which make it easier or harder :-)